Audio Systems: 1992 pathfinder, headrest screens, labour costs

Question
I'd like to install a dvd system in this truck but have a sunroof.  What options are open to me and how do you feel about the visor or dash mounted screens?  In the philadelphia area what do you guess might be reasonable to expect as a labor charge to install if I get all my stuff from ebay??

Answer
Headrest screens work well for rear passengers, my kids loved them. Make sure the shop you pick to do the install will do the installation with products they did not sell. Many will not. Also, don't be shocked if the labour costs are high, if they do agree to you providing the equipment. They then have to bench test all components before starting, and learn about each piece by reading the manuals. This is perfectly reasonable, so take this into account when deciding to buy the system from your installer or not.
OK, that said...you can do this yourself. It's not rocket science. The easiest would be two headrest screens with DVD players inside each. They make them, I've seen it. Then you just hook up a power wire, a ground wire, and sometimes a memory wire. The rear passengers then are forced to use headphones, which is better for you (driver) anyway.